Circuit Description
The switch that failed and generated the DTC is wired to either the driver door switch assembly (DDSA), passenger front door module (PFDM), left rear door module (LRDM), or right rear door module (RRDM). When a door lock switch is activated to the lock or unlock function, the DDSA, PFDM, LRDM, or RRDM receives the switch input and sends the information on, via the serial data class 2 communications line, to the rear integration module (RIM), which is the master of all lock operations. If the RIM determines that the message is a valid request and conditions are correct for a door lock function to occur, it sends its OK back to all the door modules to lock or unlock the doors. Each door module supplies power and ground to its associated lock actuator to lock or unlock the associated door.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B3142 Unlock Switch Circuit Low |
| • | DTC B3147 Right Front/Passenger Unlock Switch Circuit Low |
| • | DTC B3152 Left Front/Driver Lock Switch Circuit Low |
| • | DTC B3157 Right Front Lock Switch Circuit Low |
Conditions for Running the DTC
The DDSA, PFDM, LRDM, or RRDM must be powered and can not have B1327 Battery Voltage Low or B1328 Battery Voltage High set for this DTC to set.
Conditions for Setting the DTC
If the DDSA, PFDM, LRDM, or RRDM detects that its associated switch is closed to a lock or unlock function for more than 30 continuous seconds, it sets the DTC.
Action Taken When the DTC Sets
The DDSA, PFDM, LRDM, or RRDM ignores inputs from the associated switch until the switch state changes.
Conditions for Clearing the MIL/DTC
The current DTC will clear when the DDSA, PFDM, LRDM, or RRDM no longer detects the failure.
Diagnostic Aids
A sticking or binding switch can cause this DTC to set. Refer to Testing for Intermittent Conditions and Poor Connections .
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Door Lock/Indicator Schematics Connector End View Reference: Vehicle Access Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the scan tool display Idle? | Go to Step 3 | Go to Step 4 | |
3 |
Does the Door Lock Switch parameter change state? | Go To Testing for Intermittent Conditions and Poor Connections | Go to Step 4 |
4 |
Does the scan tool display Idle? | Go to Step 7 | Go to Step 5 |
5 | Test the appropriate door lock switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the appropriate DDSA, PFDM, LRDM, or RRDM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the appropriate door lock switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the appropriate DDSA, PFDM, LRDM, or RRDM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the appropriate door lock switch. Refer to Door Lock Switch Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |
